Abstract: A tire mounting and demounting machine includes a turntable that holds a lower rim portion of a wheel in a detachable state and rotating the wheel about a vertical rotation axial line, a bead guiding member that guides lower and upper bead portions of a tire to fit the lower or upper bead portion to an upper rim portion of the wheel and guides the upper bead portion of the tire, which is fitted to the upper rim portion of the wheel, to be demounted from the upper rim portion, and a bead roller having a pressing surface extending in a direction going away from the rotation axial line, that presses the upper bead portion of the tire mounted on the wheel from above by the pressing surface at a location on a downstream side from the bead guiding member in a rotating direction of the turntable.

Abstract: A tire mounting and removing apparatus equipped with a first aid unit for making the tire to fit on the wheel, a second aid unit for preventing the tire from slipping off the wheel, and a centering unit. The tire fitting aid unit comprises a movable push plate having rolls rotatably fixed thereto and a piston-and-cylinder drive for driving the push plate thereby to push one side of the tire while rotating, and the tire slip-off preventing aid unit comprises a movable push plate having an arm swingably fixed thereto, and a piston-and-cylinder drive for driving the push plate to permit the swingable arm to push the tire with its end. These aid units facilitate the mounting and removing of a soft tire such as a tubeless tire from the wheel. The centering unit for determining the rising distance of the tire to the wheel at a predetermined level comprises a slidable upright post having a slider mounted thereto and a pneumatic piston-and-cylinder drive for moving the upright post back and forth.